hehe like everyone has said, chins do tend to do this. they don't have the best daytime eyesight. my biggest boy Liv rarely ever runs into anything because he is so used to the room and comfortable with his surroundings. basically the same goes for my other big boy Indy. The only thing Liv does alot is misjudge his jumps and will not jump high enough, like you said. They basically use their own judgement of depth to make a jump, which isn't very accurate always. I think its adorable though. I got two new little boys and we let them out for a little bit in the bathroom last night which is obviously a new room to them and the little pink-white boy ran into my leg about every five minutes! He was fine, just seemed a little disoriented
I wouldn't worry though, he'll just need to get used to his new room! hope his nose heals well